Customers who want to know whether their smartphone is compatible with Verizon's new prepaid plans will likely have to do the dirty work and contact the carrier themselves, since Verizon isn't offering up any more clues.

On the other hand, they did offer a tip: "A new smartphone isn't necessary to take advantage of the prepaid plans," read Friday's news release, suggesting customers dig through drawers to find their old, no-longer-used smartphones.